Added a screenshot functionality based on this pr https://github.com/xenia-project/xenia/pull/2074 and added some minor adjustments.
GUI wise, "take screenshot" is under the Display menu and the keyboard shortcut to take it is F10
The screenshots folder will save to where xenia.exe or xenia_canary.exe is located. As for save paths, it will only use the id of the game due to illegal characters in some titles.
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